312db493ee
When tasks are run with -v (verbose) on the bitbake commandline, shell tasks print their stdout, python tasks do not. This change redirects the python task's print output to an in memory buffer. After the task is executed the output is printed to stdout via the logger. This makes the python task behavior match the shell task behavior when running with -v. The contents of the task's log files remain unchanged after this change. This approach should keep the correct order in most cases, however, if the python task accesses the logger directly, that content will appear before other output. On the other hand, this change should negate the need for python tasks to access the logger directly. Special care is taken to save/restore the existing stdout and stderr and preventing sending output directly to the logger when there are "recursive" calls, for instance when a python function calls a shell function, avoiding printing things potentially out of order and/or multiple times. The logging-test.bb in meta-selftest can be used to review this change. This has been tested with the full bblogging oeqa tests. [Yocto #14544] (Bitbake rev: 81a58647b2f4fc0a2589b2978fc9d81b2bfe6aec) Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Bitbake
BitBake is a generic task execution engine that allows shell and Python tasks to be run efficiently and in parallel while working within complex inter-task dependency constraints. One of BitBake's main users, OpenEmbedded, takes this core and builds embedded Linux software stacks using a task-oriented approach.
For information about Bitbake, see the OpenEmbedded website: https://www.openembedded.org/
Bitbake plain documentation can be found under the doc directory or its integrated html version at the Yocto Project website: https://docs.yoctoproject.org
Bitbake requires Python version 3.8 or newer.
Contributing
Please refer to https://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded for guidelines on how to submit patches, just note that the latter documentation is intended for OpenEmbedded (and its core) not bitbake patches (bitbake-devel@lists.openembedded.org) but in general main guidelines apply. Once the commit(s) have been created, the way to send the patch is through git-send-email. For example, to send the last commit (HEAD) on current branch, type:
git send-email -M -1 --to bitbake-devel@lists.openembedded.org
Mailing list:
https://lists.openembedded.org/g/bitbake-devel
Source code:
https://git.openembedded.org/bitbake/
Testing
Bitbake has a testsuite located in lib/bb/tests/ whichs aim to try and prevent regressions. You can run this with "bitbake-selftest". In particular the fetcher is well covered since it has so many corner cases. The datastore has many tests too. Testing with the testsuite is recommended before submitting patches, particularly to the fetcher and datastore. We also appreciate new test cases and may require them for more obscure issues.
To run the tests "zstd" and "git" must be installed. Git must be correctly configured, in particular the user.email and user.name values must be set.
The assumption is made that this testsuite is run from an initialized OpenEmbedded build
environment (i.e. source oe-init-build-env is used). If this is not the case, run the
testsuite as follows:
export PATH=$(pwd)/bin:$PATH
bin/bitbake-selftest